Troubleshooting High CPU Load¶
First, open a shell from SSH or the serial/VGA console (option 8).
Typically one of these commands will include some obvious consumer of large amounts of system resources. For example, if the system CPU usage is high, it may be the packet filter. If a VPN process is using lots of CPU, the hardware may not be able to process more VPN traffic. If it is a NIC, see Tuning and Troubleshooting Network Cards, etc.
If the solution is not obvious based on the output, post the collected information on the forum or contact support for further assistance.
View CPU Processes¶
To view the top processes, including interrupt processing CPU usage and system CPU:
top -aSH
View mbuf Usage¶
To view the mbuf usage:
netstat -m
Note
Alternately, check the dashboard mbuf counter, and the graph under Status > Monitoring on the System tab.
View I/O Operations¶
To view I/O operations:
systat -iostat 1
Or:
top -aSH
Then press m to switch to I/O mode to view disk activity.